Effect of a 3d surface indentation on boundary layer stability
File(s)
Published version
Author(s)
Xu, H
Mughal, MS
Gowree, ER
Sherwin, S
Type
Conference Paper
Abstract
We are concerned about effect of a 3D surface
indentation on instability and laminar-turbulent
transition in a boundary layer. For natural
transition in a boundary layer, the transition
onset is dominated by growth of the Tollmien-
Schlichting (TS) wave and its subsequent
secondary instability. In the paper, both linear
analysis and nonlinear calculations are carried
out to address the 3D surface indentation effect
on amplifying TS waves’ amplitudes and
prompting transition onset. By the linear
analysis, we address sudden amplification of the
TS modes by a separation bubble in a surface
indentation region. The nonlinear calculations
are implemented to validate the traditional
transition criteria predicted by the linear theory
when a 3D indentation is present. Finally,
applicability of the traditional transition
criteria is assessed.
indentation on instability and laminar-turbulent
transition in a boundary layer. For natural
transition in a boundary layer, the transition
onset is dominated by growth of the Tollmien-
Schlichting (TS) wave and its subsequent
secondary instability. In the paper, both linear
analysis and nonlinear calculations are carried
out to address the 3D surface indentation effect
on amplifying TS waves’ amplitudes and
prompting transition onset. By the linear
analysis, we address sudden amplification of the
TS modes by a separation bubble in a surface
indentation region. The nonlinear calculations
are implemented to validate the traditional
transition criteria predicted by the linear theory
when a 3D indentation is present. Finally,
applicability of the traditional transition
criteria is assessed.
Date Issued
2016-08-21
Date Acceptance
2016-04-15
Citation
ICAS proceedings, 2016
Publisher
ICAS
Journal / Book Title
ICAS proceedings
Copyright Statement
© 2016 The Authors
Sponsor
Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (E
Royal Academy Of Engineering
Engineering and Physical Sciences Research Council
Identifier
https://www.google.co.uk/url?sa=t&rct=j&q=&esrc=s&source=web&cd=5&cad=rja&uact=8&ved=0ahUKEwiJlrfoyOjQAhVLBcAKHSBUAMYQFggzMAQ&url=https://www.eiseverywhere.com/retrieveupload.php?c3VibWlzc2lvbl8xMzEzNzJfNzQzODIyLnBkZiplc2VsZWN0&usg=AFQjCNEga2Hq-MMf61jobIFo24GwjZXCog
Grant Number
EP/H000208/1
EP/I037946/1
AEDZ_P40009
EP/I037946/1
Source
24th International Congress of Theoretical and Applied Mechanics ICTAM 2016
Publication Status
Published
Start Date
2016-08-21
Finish Date
2016-08-26
Coverage Spatial
Montreal, Canada